Re: "Silly" question about IP, NICs, and Linux

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Mateus,

This is pretty simple. You can generally just use ifconfig to create an alias; such as:
ifconfig eth0:1 10.0.0.1 netmask 255.255.255.0 up
ifconfig eth0:2 etc etc etc

Also, in Redhat distros you can make a "range" file with a range of IP's to map to the box. The range file needs to be named "ifcfg-eth0-range#".

The contents describe the IP range to be mapped which also survives a reboot, or restart with /etc/init.d/network

Here's a sample of /etc/sysconfig/network-scripts/ifcfg-eth0-range0:


IPADDR_START=10.0.0.1
IPADDR_END=10.0.0.254
CLONENUM_START=1
NETMASK=255.255.255.0
BROADCAST=10.0.0.255


This maps .1 -> 254 to this box starting with eth0:1

For multiple ranges create a different range# file.
Obviously for other NIC's alter eth0 appropriately.
Other distros probably have similar options.

Regards,
Jason H.
TouchSupport, LLC

Mateus Interciso wrote:
Hello,
Is there a way to create thousands of internal ips (like 10.0.0.1) on just one linux box, with 2 NICs? I need this for a final paper for university, it would be about routing and load balancing, and since I don't have thousands of computers, I would need another way, is there any?

Thanks a lot.

Mateus

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